Sensor Localization for Sensor Localization for Location-Based AuthenticationLocation-Based Authentication

Valliappan AnnamalaiValliappan AnnamalaiAndAnd

John Quintero John Quintero

Project GoalsProject Goals

Develop a localization mechanism for Develop a localization mechanism for use in location-based authentication.use in location-based authentication.

Location-based access to computing Location-based access to computing resources.resources.

Focus on determining location Focus on determining location indoors. indoors.

ChallengesChallenges

Indoor signal propagation subject to Indoor signal propagation subject to suffers from multipath propagation, suffers from multipath propagation, shadowing and scattering. shadowing and scattering.

Use scene analysis by constructing a Use scene analysis by constructing a signal-strength map of the lab.signal-strength map of the lab.

Antenna orientation and pedestrian Antenna orientation and pedestrian traffic cause local variation in signal traffic cause local variation in signal strength.strength.

Project ApplicationsProject Applications

BadgeBadge Base StationBase Station Serial ForwarderSerial Forwarder Tracker SenderTracker Sender Tracker ServerTracker Server

Example ArchitectureExample Architecture Six base stations are used to capture signal Six base stations are used to capture signal

strength information from a badge, which is strength information from a badge, which is compared to a pre-compiled mapping.compared to a pre-compiled mapping.• B: badge broadcasts id to establish its location.B: badge broadcasts id to establish its location.• BS: wireless base station captures badge signal BS: wireless base station captures badge signal

strength, forwards to base station.strength, forwards to base station.

BS

B

BSBS

BSBSBS

Application MessagingApplication MessagingBadge Base Station Tracker Server

Serial Forwarder

Tracker Sender

W/L MessageWith Bdg ID

Bdg Msg WithBS ID and SignalStrength

Forwards theMessages itReceives

UDP data packets withBS message

W/L MessageWith Bdg ID

1 Sec

One PCSecond PC